Single-arm stand



FIG. 1 is a perspective view of a single-arm stand showing of my new design;

FIG. 2 is a front elevational view thereof,

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a single-arm stand, as shown and described. 